<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>克隆优化节点操作</title>
</head>
<body>
    <p id="box1">old</p>
    <script>
        for (var i = 0; i < 3; i++) {
            var element = document.createElement('p')
            element.innerHTML = i
            document.body.appendChild(element)
            
        }

        var oldP = document.getElementById('box1')
        for (var i = 0; i < 3; i++) {
            var newP = oldP.cloneNode(false)
            newP.innerHTML = i
            document.body.appendChild(newP)
            
        }
    </script>
</body>
</html>